I found out last week how bad carbon fibre is, most cheap carbon fibre frames are built in China, to sand down CF you need to do it underwater (because of the highly toxic chemicals) but guess what, this is expensive & time consuming, so they give them 20Cent paper masks, but at least they get "lightweight" CF lungs.

I guess what I am trying to say is... I do my bit

Edit:
According to my phone:
Max Speed: 36km/h
Av Speed: 24km/h